Question

I. Six hundred and seventy registered voters were surveyed and asked their political affiliatiorn and whether or not they favor a national health care policy. The results are below Democratic) 160 IndepenntD) Republican E) Favor national healthcare policy(A) Do not favor national healtheare policy(B) 30 130 100 50 200 . P(A) 2. P(C or D) 3. P(C and D) 4. P(B 1 D) 5. P(B') 6. P(D or E) 7, P(B and C) 8. P(E |A) II. A study found the sample average age of mothers to be 26.8 and a sample standard deviation of 6.1. Student One reports a 90% confidence interval for mean age ofall mothers giving birth as (26.4, 27.2). Student Two gives the 90% confidence interval as (257, 26.5). One of the two students has made a mistake. Which student gave the wrong interval? How can you tell? IlI. The GPA of all college sophomores has a mean of 3.14 and a standard deviation of 1.8. a) Find the probability that one college sophomore has a GPA greater than 3.5 b) What GPA has a percentile rank of 86? c) If a random sample of 54 college sophomores is take, find the probability that their mean GPA is less than 2.8.

Answer 1